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Global System for Mobile (GSM) Communications is a digital cellular system that uses narrowband Time Division Multiple Access (TDMA) technology. It allows eight simultaneous calls on the same radio frequency.

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Bayonet Neil-Concelman (BNC) connectors were designed for military applications, but are used widely in video and RF applications to 2 GHz. BNC connectors have a slotted outer conductor and a plastic dielectric that causes increasing losses at higher frequencies. BNC connectors are usable above 4 GHz as long as the slots radiate signals; however, these devices may not be mechanically stable to 10 GHz. Both 50Ω and 75Ω BNC connectors are available. BNC connectors are also known as bayonet navy connectors or baby Neil connectors.

FireWire® is a cross-platform implementation of the high-speed serial data bus, defined by IEEE 1394, that can move large amounts of data between computers and peripheral devices. It features simplified cabling, hot swapping, and transfer speeds of up to 400 Mbps. FireWire speeds the movement of multimedia data and large files. It also enables the direct connection of digital consumer products such as digital camcorders, digital videotapes, digital videodisks, set-top boxes, and music systems to personal computers (PC). FireWire is a registered trademark of Apple Computer, Inc.

ISDN devices must have a terminator (NT1 terminator) between the ISDN device and the wall jack. The U interface connects NT1-terminated ISDN devices to the telephone company's ISDN wall jack. Many ISDN devices have a U interface for direction connection to the wall jack.

Serial port or asynchronous serial interfaces are system-to-system communication interfaces in which data is sent over a single wire (serial). Serial communications include RS232, RS422, and RS485, etc.

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Restriction of Hazardous Substances (RoHS) is a European Union (EU) directive that requires all manufacturers of electronic and electrical equipment sold in Europe to demonstrate that their products contain only minimal levels of the following hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyl, and polybrominated diphenyl ether. RoHS will become effective on July 1, 2006.

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